Gas burner



I Oct 1944- s. w. E. ANDERSSON 2,360,310

GAS BURNER Original Filed May 8, 1957 J I i J I l I J T 3 20 Fig.1. 3/ 3 m E 3 52 L19 y 2L E J? 42 if '9 J7 36 j? i I T 635 ,Z 9-r I f4 /5 l i 9 W I I 32 33 um my F- 2 I II a a 0 4'7 5 39" {0 A 7 37 I INVENTOR.

2,2 W 7 BY j m LU. dam 34 24 27 1 24 4 ATTORNEY tion.

Patented Oct. 17, 1944 UNITED STATES PATENT OFFICE GAS BURNER Sven W. E. Andersson, Evansville, Ind., 'assignor to Serve], Inc., New York, N. Y., a corporation oi. Delaware Original application May 8, 1937, Serial No.

Divided and this application May 8, 1940, Serial No. 333,909

2 Claims. (Cl. 15s-11s) This invention relates to gas burners which provide a heating flame resulting from a mixture oi air and a combustible gas, and more particularly to such a burner in which air is mixed with the combustible gas before it is: discharged from the burner toproduce and maintain the heating flame. This application is a division of my application Serial No. 141,423 filed May 8, 1937, now Patent No. 2,228,296.

It is an object of the invention to provide an 10 improved burner 01 this type-having a primary air shutter which can be easily adjusted and which will require a minimum amount ofattengrooves 25'. The grooves 25'. are at an angle.

with respect to the direction of gas flow whereby a whirling motion is imparted to gas fiowln'g'upward in passage 23. The gas discharged from orifice 24 passes into a mixing chamber 26 formed in the lower end of a burner tube 21 which is threadedly secured to the bodym'ember In and concentric with respect to the passage. l8, and

The above and other objects and advantages 01' 15 Orifice g the invention will become apparent irom the following description taken in conjunction with the accompanying drawing forming .a part of this specification, and of which Fig. 1 isa vertical 0 sectional vie o a -bumer mbodyin the in- 3 f w I gas 8 g in the chamber to provide a combustible gas mixvvention; Fig. 2 is a sectional view taken on line 2-2 of Fig. 1; and Fig. 3' is a vertical view of a burner, partly in. section, illustrating a modification of the invention. :5

Referring to Fig. l, the improved burner em-'- bodylng the invention includes a. body member ID having a threaded opening 'II which is adapted to be connected to a conduit or a gas supplyline. The opening I I communicates with a chamso her I2 which in turn communicates with a passage I through an orifice IS. The flow or gas through orifice I5 is controlled by a valve l6 which forms part of a safety cut-oil mechanism to be described 'hereinaiten- 8.6

The passage u is in line with the-opening ii and the right hand end thereoi is permanently sealed with a plug 11. The opposite end otpassage ll intersects a passage it which is threaded at its lower end to receive an adjustment screw I2. The passage I2 is sealed with a removable cap screw 20. By removing-the cap screw 20 the adjustment screw it may be set to any desired position opposit t a e: H to determine the arrangement particlu of dust and-lint in the air maximum flow. or gas to the burner and hence the maximum size of the burner flame.

--'The adjustment screw I 9 is'recessed atboth ends andprovided with a small central opening 2| intermediate the'frecessed ends, so .that .the Bus w delivery of clean primary air into the mixing pressure in the upper part .91 passage It can be. measured at any time by removing cap screw 2| and securing a manometer to the lower threaded 'end 0! e18; when thegaspressure is not Thelower en 01 burner tube 21 is provided with a plurality of ports or openings 28 to ad mit primary air into chamber 26. The primary air and gas, which is introduced into chamber 26 with a whirling motion, are thoroughly mixed toward the 'upper end which is provided with a' cap 30 having a plurality of openings 31. The

gas mixture formed in chamber 28 flows upward through the burner tube 21 and is discharged at the openings ii at which region the. burner flam isproduced andmaintained. I

A tube 22 concentrically disposed about the burner tube 21 is secured by a cap screw 32' to. the top of body member ID. The-tube 32 provides :1 enclosed space about the burner tube 21 so the primary air introduced into chamber 20 through the openings 28 must be drawn downward from the upper open end of tube 32. By

- terminating the upper end of tube 22 closely adjacent to the openings ll in cap 20, the direction of flowoi air drawn downward in' tube" is reversed considerably due to the fact that the flow of air is upward about the burner flame,- as indicated by the arrows-in Fig. 1. With this .within tube 12.x The tube 02, which may be 1 8-.

ierred to as a dust. prevention tube since it insures chamber 28, is describedmore full in Forbers f Patent No. ,os9,oe2,

Within e tube :2 is arranged a sleeve um- I in: an inward extending flange It at its lower at the desired value, the adjustment screw I! u The sleeve 22 is vertically movable within tube 32 by a member 35 which is secured thereto and extends outward in a vertical slot-or opening 36. A spring clip 31, which is secured to the sleeve 33'and frictionally engages the inside of tube 32, is provided to maintain the sleeve 33 in any desired vertical position. The sleeve 33 constitutes an air shutter for controllingthe quantity of primary air admitted into the mixing chamber-26. When the sleeve is in the position shown in Fig. 1 the flange 34 is substantially opposite the ,upper end of the inward sloping portion 29 of the burner tube 21, so that the maximum amount of primary air is admitted past the burner tube 21 and flange 34 into the mixing chamber 26. "As the sleeve 33 is moved downward the amount of primary air admitted into the mixing chamber 26 is reduced due to the narrowing of the opening between the flange 34 and sloping portion 29 of the burner tube 21. When the flange 34 is in the position indicated in dotted lines in Fig. 1, a minimum amount of primary air is admitted into chamber 26 through the openings 23.

If for any reason the burner flame is extinguished it is desirable to shut off the flow of gas to the burner. This is accomplished by providing a safety cut-off mechanism including the valve IS in chamber l2. The valve I6 is of the ball type and is urged to its closed position by a coil spring 38 which is maintained in position within the recess of a cap screw 39. The lower enlarged head of a-pin 40 bears against the valve l6 to move the latter to its open position against the action of coil spring 33. The pin 40 extends upward through an opening 4| in the body member l6 and the upper end thereof may be threadedly secured to a push button 42. The push button is movable in a hollow sleeve 43 which may be formed integrally with the body member I3. A'

suitable packing 44 is provided about the pin 4| at the lower end of sleeve 43 to prevent leakage of gas through the opening 4|. Between the push button 42 and packing 44 is arranged a coil spring 45 which tends to move the pin 40 upward and thereby permit valve |6 to move to its closed position.

To maintain valve I6 in its open position during operation of the burner, the push button 42 is provided with an annular groove 46 to receive an outward extending bent end of a bimetallic strip 41. The lower bent end of the strip 41 extends through an opening 43 in the tube 32. The strip 41 extends upward within the tube 32 and is secured intermediate its ends at 49 to the upper part of tube 32. A portion of the sleeve or air shutter 33 is cut away, as shown most clearly at 53 in Fig. 2. to permit-free radial movement of the strip 41. From the tube 32 the strip 41 extends upward into the vicinity of the burner flame. The upper end of strip 41, which serves as a heat conductor, may be plated with a suitable metal having. a greater resistance to corrosion. than the metals used in forming the bimetallic strip. Instead of plating the upper projecting end of strip 41, a suitable piece of metal having a high resistance to corrosion may be secured thereto. To prevent flow of heat from material 52 is provided at the region where the strip is secured to the tube 32.

" "The operation of theburner and safety device just described is substantially as follows: To start the burner the push button 42 is pressed downward to move valve l6 to its open position. This the lower part thereof wil be flexed outward and the bent lower end will extend into the grooved portion 46 of push button 42, as shown inFig. 1. When this occurs the push button 42 may be released and valve I5 will remain in its open position.

If for any reason the burner flame is extinguished the bimetallic strip 41 will no longer be heated, whereby the lower part of the strip will be flexed inward and release the push button 42. With the extreme lower end of-strip 41 no longer extending into the grooved portion 46 of push button 42, the coil spring 45 will be effective to move pin 40 upward and coil spring 33 will cause valve l6 to move to its closed position.

off mechanism is such that a simple and compact structure is provided which will occupy a minimum amount of space. In starting the burner it is only necessary to press the push button 42 and then ignite the gas mixture at the openings 3|. After a hort interval of time the push button may be released when the strip 41 has defiected outward into the grooved portion 46 or the button. Since the bimetallic strip 41 is located within the tube 32 it is well protected. Only a relatively few parts are required to provide the burner since the mixing chamber 26 forms part of the burner tube 21 and the latter is so shaped that the sloping wall portion 23 thereof cooperates with the air shutter 33 to control the amount of primary air admitted into the mixing chamber. A burner of the character described is particularly adapted for heating ab-' since the burner needs only a minimum amount of attention.

"The modification shown in Fig. 3- is similar to the embodiment just described and differs therefrom only in the provision of a second safety valve which cooperates with the safety valve I6 to prevent leakage of gas from the body member I. In this modification a valve seat 53 is provided at the orifice 4| through which the lower reduced portion of pin 43 extends. The region of pin 40' where it becomes larger in diameter serves as a valve 54 which cooperates with the seat 53. The pin 40' is provided with a flange 55 at its upper end, and between this flange and packing 44' is arranged a coil spring 45'. The push button 42' is'provided with a flange 56 and is recessed to receive a coil spring 51 which bears against the flange 55 or the pin 43'. The push button 42 is retained in position within sleeve 43 by a member 53 which is threadedly securedv permits gas to flow from chamber |'2 through ori- 5; valve l6 and instigate operation of the burner,

the valve 54 is moved to its closed position on the seat 53. In addition to the packing 44', therefore, additional safety is provided by the closing of valve 54 so that no leakage of gas will occur from the. body member "I through the orifice 4|, When valve IE is moved to its open position the downward force exerted by coil spring 51 must overcome the upward force exerted by coil springs 45' and 38. By providing the 'push button 42' with the coil spring 51, the button may bepressed downward a little more than is actually necessary. to open valve l6, whereby the lower bent end of bimetallic strip 4'! will readily enter the space above the flange 56 and prevent upward movement of the push button when it is released.

Although particular embodiments of the invention have been shown and described, it will be apparent that modifications and changes may be made without departing from the spirit and scope of the invention.

What is claimed is: g

1. In a gas burner, structure providing a mixing chamber and a burner tube projecting therefrom, said mixing chamber having a gas inlet opening and air inlet openings, a casing around said mixing chamber and burner tube and spaced therefrom, to form therewith a passage for flow sage.

2. In a gas burner, structure providing a mixing chamber and a burner tube projecting therefrom, said mixing chamber having a gas inlet opening and air inlet openings, a casing around said mixing chamber and burner tube and spaced therefrom to form therewith a passage for flow of air to said inlet openings, said structure having an' exterior sloping wall portion which with said casing so forms a part of said passage that the cross-sectional area thereof varies in the direction of air flow therethrough,rancl a shutter member slidably mounted on said casing and having a portion thereof extending toward said sloping wall and movable relative to said sloping wall to adjust the rate of flow or air in said passage.

SVEN W. E. ANDERBSON. 

